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J. Exp. Med., Volume 187, Number 5, March 2, 1998 663-674

B Lymphocytes Differentially Use the Rel and Nuclear Factor kappa B1 (NF-kappa B1) Transcription Factors to Regulate Cell Cycle Progression and Apoptosis in Quiescent and Mitogen-activated Cells

By Raelene J. Grumont,* Ian J. Rourke,* Lorraine A. O'Reilly,* Andreas Strasser,* Kensuke Miyake,Dagger William Sha,§ and Steve Gerondakis*

From * The Walter and Eliza Hall Institute of Medical Research, Post Office The Royal Melbourne Hospital, Victoria 3050, Australia; the Dagger  Department of Immunology, Saga Medical School, Nabeshima, Saga 849, Japan; and the § University of California, Berkeley, California 94720

Rel and nuclear factor (NF)-kappa B1, two members of the Rel/NF-kappa B transcription factor family, are essential for mitogen-induced B cell proliferation. Using mice with inactivated Rel or NF-kappa B1 genes, we show that these transcription factors differentially regulate cell cycle progression and apoptosis in B lymphocytes. Consistent with an increased rate of mature B cell turnover in naive nfkb1-/- mice, the level of apoptosis in cultures of quiescent nfkb1-/-, but not c-rel-/-, B cells is higher. The failure of c-rel-/- or nfkb1-/- B cells to proliferate in response to particular mitogens coincides with a cell cycle block early in G1 and elevated cell death. Expression of a bcl-2 transgene prevents apoptosis in resting and activated c-rel-/- and nfkb1-/- B cells, but does not overcome the block in cell cycle progression, suggesting that the impaired proliferation is not simply a consequence of apoptosis and that Rel/NF-kappa B proteins regulate cell survival and cell cycle control through independent mechanisms. In contrast to certain B lymphoma cell lines in which mitogen-induced cell death can result from Rel/NF-kappa B-dependent downregulation of c-myc, expression of c-myc is normal in resting and stimulated c-rel-/- B cells, indicating that target gene(s) regulated by Rel that are important for preventing apoptosis may differ in normal and immortalized B cells. Collectively, these results are the first to demonstrate that in normal B cells, NF-kappa B1 regulates survival of cells in G0, whereas mitogenic activation induced by distinct stimuli requires different Rel/NF-kappa B factors to control cell cycle progression and prevent apoptosis.


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